Findserialnumber.net: [portable]

Not all serials are 10-12 digits. Some have letters, dashes, and spaces. FindSerialNumber.net includes a that tells you if a string looks like a serial (e.g., “CN-0XXXX-XXXXX” for Dell) or something else (like a service tag).

To demonstrate the utility, here are the most common lookup queries on FindSerialNumber.net. findserialnumber.net